EP3577367A1

EP3577367A1 - Fluid damper for bodies that are movable relative to one another, comprising a piston that is movably guided in a cylinder.

Info

Publication number: EP3577367A1
Application number: EP18756381.2A
Authority: EP
Inventors: Wolfgang Held
Original assignee: Individual
Current assignee: Individual
Priority date: 2017-08-02
Filing date: 2018-08-02
Publication date: 2019-12-11
Anticipated expiration: 2038-08-02
Also published as: DE202018006847U1; WO2019025568A1; EP3577367C0; US11261639B2; CN111133221A; US20200240190A1; CN111133221B; EP3577367B1

Abstract

The invention relates to a fluid damper for bodies that are movable relative to one another, said damper comprising a piston (4) that is movably guided in a cylinder (1). At least one through opening (4.2) is provided in the piston and/or between the piston and the cylinder for through-flowing fluid. Adjustment means are provided on the fluid damper for adjusting a delimitation at least of the maximum possible through-flow cross section for the fluid at at least one passage opening. The piston is connected to a piston rod (6) leading out of the cylinder. The adjustment means comprise a locking apparatus (2) which is pushed, in a radially non-twistable manner, onto the end of the piston rod located in the cylinder, and holds the piston in a desired position in the cylinder.

Description

The invention relates to a fluid damper for mutually adjustable bodies, in particular furniture parts, with a piston which is displaceably guided in a cylinder according to the preamble of claim 1.

The piston divides the cylinder into two fluid spaces. So that during a movement of the piston in the cylinder along its longitudinal or cylindrical axis, a fluid exchange between the two fluid spaces can take place, at least one passage opening is provided in the piston and / or between the piston and cylinder.

During axial movement of the piston rod and thus of the piston relative to the cylinder, the fluid must pass through the passage opening in the piston and / or between the piston and the piston. ben and cylinder flow. The resistance encountered by the fluid creates pressure differences between the fluid spaces which cause a damping force. In a fluid damper according to DE 20 2014 002 228 U1, the piston is connected to a piston rod brought out of the cylinder. The piston rod can be brought into contact with the adjustable furniture part. The cylinder is connected with the rod end closed with the fixed furniture part. In the piston, a passage opening for an in-cylinder fluid is provided. As the bodies move relative to each other, depending on the velocity or pressure on the piston rod, a vane rotatably mounted on the piston progressively closes the port in the piston, along with a reduction in the flow area. When moving the bodies from each other, a spring returns the wing on the piston and releases the passage opening. The cylinder is closed at the open end side with a closure part.

From DE 20 2005 020 820 U1 also a fluid damper is known. In order for extreme damping to be prevented in the case of this known fluid damper in the event of overloading, that is to say under great pressure, it is proposed that at least one overload opening in the piston and / or between the piston and cylinder be opened above a threshold value of the pressurization on the fluid damper. This ensures that no damper bounce occurs and a hard closing of the body is prevented without the threshold value of the pressurization is achieved by a special configuration of the passage opening in the piston or between the piston and cylinder and without special shapes and sizes of the passage openings selected Need to become. The state of the art has in common that the resistance is predetermined, for example, by the size of the passage openings. The resistance is on the fluid damper to adapt to regularly by, for example, different sized and different heavy, according to different sluggish mutually adjustable body resulting different applications subsequently not adjustable.

By WO 2007/099100 a damper for furniture is known. This comprises a housing in which a piston connected to a piston rod is slidably received. Upon movement of the piston within the housing, a fluid flows through a flow passage in or on the piston. When moving the piston in different directions, a different damping is obtained. This is done by means of a relatively movable in the direction of movement of the piston plate. On the piston protrusions are arranged, which define a smallest cross section of the flow channel in a first direction of movement of the piston. In the opposite direction of movement, the plate can lift off the piston and thereby releases a larger cross-section. The flow channel can be adapted by different high projections on the plate to different desired damping properties. As a result, dampers with different damping properties are obtained by different plates with differently high projections. Without an associated with a dismantling of a finished damper replacement of each built-in plate no change in the damping properties is possible. A simple, subsequent adaptation of the damping properties of a finished damper is thus not possible.

DE 195 32 996 B4 discloses a gas spring in which the extension speed of a piston rod which is guided longitudinally displaceably in a cylinder and which divides the cylinder into two fluid chambers is changed by means of tion of the length of a leading through the piston flow path is adjustable. The cross section of the flow path is not changed with a change in the length of the flow path. The piston is movably guided along the piston rod and in its rotational position about the longitudinal axis of the cylinder.

WO 85/04935 A1 discloses a linear damper with a piston guided in a cylinder along its longitudinal axis and in its rotational position about said piston. The piston divides the cylinder into two fluid spaces. In the piston passage openings for the fluid compensation required between the fluid chambers for movement of the piston along the longitudinal axis are arranged. In at least some of the passage openings disposable valves are arranged. A shim movable with the piston along the longitudinal axis may be rotated from outside the cylinder via an adjustment shaft extending along the longitudinal axis and connected to a dial to switch between three settings:

the same high flow resistance as the piston moves relative to the cylinder in both opposite directions along the longitudinal axis of the cylinder,

high flow resistance when moving the piston in a first direction, low flow resistance when moving the piston in a second direction opposite to the first direction, and

low flow resistance when moving the piston in the first direction, high flow resistance when moving the piston in the second direction opposite to the first direction.

DE 1996320 U discloses a hydraulic damper. This comprises a cylinder and along its longitudinal axis and in its rotational position about these movably arranged and dividing the cylinder into two fluid chambers piston. A channeled closing plate, which is pressed by a spring load against the piston, is arranged rotatable about a piston rod. In the piston passage openings for the fluid compensation required between the fluid chambers for movement of the piston along the longitudinal axis are arranged. Depending on the selected rotational position of the closing plate, the passage openings are more or less released. An accessibility or even adjustability of the closing plate for subsequent influence on the fully assembled damper on the release of the passage openings is not provided. The object of the invention is to further improve the fluid damper defined in the preamble of claim 1, namely to adapt it to different applications. The stated object is solved by the features of claim 1. Advantageous embodiments are given in the dependent claims.

By presettable the geometric cross-section of at least one passage opening in the piston and / or between the piston and cylinder, the fluid damper can be adapted to different Anwendungswecke, for example on the flaps and doors of a cabinet.

The presettable is advantageous given the ready assembled and ready for use fluid damper. It is particularly advantageous from the outside accessible at the ready assembled and ready to use fluid damper given. This is inventively achieved in particular by the fact that the piston by means of a locking device in a constant rotational position - short position - relative to, or against the cylinder, non-rotatably guided along the longitudinal axis. Unrotatability, ie a rigid connection, can be wise be given to a common longitudinal axis. The Unverdrehbarkeit can be given in particular as long as the locking device of the piston does not engage positively in a part of the cylinder. The Unverdrehbarkeit can be effected in particular by a frictional engagement, which in the form-locking engagement of the locking device in a part of the cylinder, in particular by a rotational movement on the piston, can be overcome.

The locking device may for example be a groove or a projection in the cylinder parallel to its longitudinal axis and a corresponding configuration of the piston. The corresponding embodiment may include, for example, a nose sliding in the groove or a notch sliding on the projection on the circumference of the piston.

In principle, it is conceivable that the locking device comprises a cross-sectional geometry deviating from the circular shape of the cylinder and of the piston movably guided in the latter.

The locking device according to the invention provides the possibility of setting a limit. This can comprise at least the largest possible flow cross section of the fluid, which is also referred to as an effective cross section of the at least one passage opening. The effective cross-section can be present at at least one point of the passage opening on the operationally ready, ready-assembled fluid damper, which is preferably already installed between the adjacently adjustable bodies.

For example, from outside the cylinder, for example by a rotational movement about the longitudinal axis of the cylinder, a flow cross-section of the fluid can be influenced. This can be done in at least one place Passage opening done. Without a locking device, on the one hand, the piston could twist relative to the cylinder. By an unintentional change in the rotational position of the piston relative to the cylinder, a setting made by a rotational movement of a limitation of at least the largest possible flow cross section of the fluid at the passage opening can be changed in an intimate manner.

Further embodiments of the fluid damper can be taken from the subclaims. Thus, according to a further advantageous embodiment of the invention, the locking device consists of the following components:

a locking element in the form of a sleeve which can be applied to the end of the piston rod,

- The end of the sleeve, which faces the closed end of the cylinder, know an externally toothed gear

the other end of the sleeve (in the longitudinal direction of the cylinder) has at least one cam which engages in the piston,

- An internally arranged at the closed end of the cylinder internal gear, in which engages the external gear, and

- A centrally disposed on the closed end of the cylinder central cone, which presses the teeth of the external gear apart in the internally toothed gear.

According to a further advantageous embodiment of the invention, a dial is fixed against rotation on the outside of the cylinder lying end of the piston rod. Preferably, this dial carries a Außenriefelung.

The invention will now be explained in more detail with reference to drawings. Show it: 1 is an exploded perspective view of a fluid damper of cylinder, locking element, sleeve with wing, spring, piston, piston rod, notch disc, closure member and dial,

2 is an enlarged perspective exploded view of the closed end portion of the cylinder and usable there components of the fluid damper of Fig. 1,

3 is a further enlarged exploded perspective view of components of the fluid damper of FIG. 1,

4 is a perspective view similar to FIG. 1 of the fluid damper, but in the assembled state, in which the wing and the notching disc are in the initial state,

5 is an enlarged perspective view of the left part of FIG. 4 with a cut-open cylinder,

Fig. 6 is another of FIG. 4 similar perspective view of the fluid damper with cut cylinder and

7 shows a partial cross section through the fluid damper of FIG. 6. FIG.

A fluid damper, which is shown in full or in part in FIGS. 1 to 7 for mutually adjustable bodies, is equipped with a piston 4 adjustably guided in a cylinder 1. The piston 4 divides the cylinder into two fluid spaces. In order for a fluid exchange between the two fluid chambers to take place during a movement of the piston 4 in the cylinder along its longitudinal or cylinder axis, at least one passage opening 4.2 for through-flowing fluid is provided in the piston 4 and / or between the piston 4 and the cylinder 1.

The piston 4 is cylindrical and advantageously adapted with its outer diameter to the inner diameter of the cylinder 1. Alternatively, a gap between the inner diameter of the cylinder 1 and the outer diameter of the piston 4 forms one of a plurality of passage openings 4.2.

The fluid damper is characterized by at least one adjusting means for the subsequent adjustment of a boundary of at least the largest possible flow cross-section of the fluid, which is also referred to as an effective cross-section of the at least one passage opening 4.2. The setting of the effective cross-section takes place at least at one point of the passage opening 4.2 on the ready-to-use, ready-assembled, preferably already installed between mutually adjustable body fluid damper.

The one or more adjusting means are accessible and / or adjustable at least without disassembling the finished assembled and ready Fiuiddämpfers. The one or more adjustment means are particularly advantageous accessible and / or adjustable from the outside on the ready assembled and ready to use fluid damper.

With the at least one adjustment means, at least the largest possible flow cross-section of the fluid at the location of the fluid passage opening 4.2 of the piston 4 can be preset. The restriction according to which the adjustment results in a limitation of at least the largest possible flow cross section of the fluid at the passage opening 4.2, involves two design options:

1. that, on the one hand, a constant flow cross section prevails during the work of the fluid damper;

2. that the flow cross section changes during the work of the fluid damper.

For example, the flow cross section is progressively reduced with increasing movement speed of the piston 4 in the cylinder 1. In the latter case, the adjusting device serves to preset the maximum flow cross section which prevails, at least when the piston 4 is not moving.

The flow cross-section is the geometric cross-section available to the fluid to flow from one fluid space to the other at least at a youngest / narrowest point of the port 4.2. The smaller the cross-section, the higher the flow resistance acting on the fluid as it flows from one fluid space into the other. As the cross-section increases, the flow resistance decreases, as a result of which the force acting on the piston with a larger cross-section and lower flow resistance takes place more rapidly than in the case of a smaller cross-section and higher flow resistance, a faster movement of the piston 4 in the cylinder 1.

It is important to emphasize that a change in the geometric cross section in the context of the invention in particular comprises a change in the cross-sectional area, but alternatively or additionally, a change in the cross-sectional geometry and / or cross-sectional dimensions may include. Thus, the presetting of at least the largest possible flow cross-section may be accompanied by a change in the orifice geometry of the fluid passage opening 4.2 of the piston 4, for example, by rejuvenation / change of the largest possible flow cross-section an otherwise consistently constant passage opening at least in a direction of flow to a Borda-Carnot mouth. As a result of the influence on the geometric cross section according to the invention, the flow resistance occurring during the passage through the flow path, which is anyway at least substantially constant in the fluid damper according to the invention, remains unaffected. The invention thus provides a simple possibility for a subsequent influence on the hydraulic cross section of the fluid passage opening 4.2 on the finished composite fluid damper.

The piston 4 may be connected to a led out of the cylinder 1 piston rod 6. The adjusting means advantageously comprise an on the in-cylinder end of the piston rod 6 radially non-rotatably pushed, the piston 4 in a desired position in the cylinder 1 arresting locking device.

In the desired position, in which the locking device holds the piston 4 in the cylinder 1 radially non-rotatably, it is therefore the rotational position of the piston 4 relative to the cylinder 1 to an advantageous common longitudinal axis of the piston 4 and cylinder 1 seen. A movement of piston 4 and cylinder 1 relative to each other along the longitudinal axis, however, does not affect the locking device.

The presettable is given by the ready assembled and ready for use fluid damper. This is achieved in particular by the fact that the piston 4 by means of / via the locking device in a consistent, short as a location designated rotational position relative to or relative to the cylinder 1, for example, non-rotatably guided about a common longitudinal axis along the longitudinal axis. The locking device can be formed, for example, by a groove or a projection in the cylinder 1 parallel to its longitudinal axis and / or a corresponding configuration of the piston, for example with a groove sliding in the groove or a notch sliding on the projection on the circumference of the piston 4, or such Means include. In principle, it is conceivable that the locking device comprises a cross-sectional geometry deviating from the circular shape of the cylinder 1 and the piston 4 movably guided in the latter.

The locking device according to the invention provides the possibility of setting a limitation of at least the largest, also as effective cross section of at least one passage opening 4.2 designated flow cross section of the fluid at least one point of the passage opening 4.2 on ready, fully assembled, preferably already installed between mutually adjustable body fluid damper. Thus, for example, can be influenced from outside the cylinder 1 in particular by an easy-to-realize rotational movement - be it by rotation of the piston rod about the longitudinal axis of the cylinder or by a separate, parallel to the piston rod shaft - flow cross-section of the fluid at least one point the passage opening 4.2.

In this context, it can be seen that the locking device - and with it the one or more adjusting means - alternatively or additionally, such a shaft may include. Such a shaft may be arranged parallel and / or coaxial with the piston rod and / or comprise the piston rod.

Without a locking device, on the one hand, the piston 4 could rotate with respect to the cylinder 1 and, on the other hand, by changing its rotational position relative to the cylinder 1, cancel a setting made by a rotational movement of a limitation of at least the largest possible flow cross section of the fluid at the passage opening 4.2. It is important to emphasize in this context that in this document the term axis, in contrast to the term shaft, denotes a geometric axis and not a machine element.

Alternatively or additionally, the adjustment means may comprise a non-rotatably mounted on the piston rod 6 notched disc 7. By means of at least one notch 7.1 of the notching disc 7, the flow cross section of the fluid at the location of at least one also referred to as fluid passage opening passage opening 4.2 of the piston 4 and / or between the piston 4 and cylinder 1 can be preset. A further notch 7.2 on the notching disc 7 may be in engagement with a lug 4.4 on the piston 4 and restrict adjustability of the restriction of the fluid flow through the opening 4.2. The throttling of the fluid flow may in particular be effected by a relative position of opening 4.2 and notch 7.2.

The adjusting means or preferably comprises at least one adjusting device which influences at least the largest possible flow cross-section of the fluid at the at least one passage opening 4.2. The one or more adjusting means preferably comprise at least one cooperating with the adjusting device or acting on this, subsequently from the outside on Ready ready assembled and preferred already installed between mutually adjustable bodies fluid damper accessible actuator. This is designed to change an effective during operation or upon actuation of the fluid damper limitation of at least the largest possible flow cross-section of the fluid at the location of the passage opening 4.2 of the piston 4 and / or between the piston 4 and cylinder 1 by default.

In the embodiment described above, the piston rod 6 forms the actuating device, which is accessible from the outside and is actuated by turning and thereby acts on the rotational position of the notching disc 7.

The adjusting device can be defined by the following features:

- The non-rotatably arranged with respect to the piston rod 6 Notch 7 with its at least one notch 7.1

- Which holds the piston 4 in a desired position in the cylinder 1 and thus a common rotation of the piston rod 6 and the piston 4 preventing locking device

- Fixed with the piston, the circumferential position of the at least one passage opening 4.2 relative to the cylinder 1 is preventing locking device.

The locking device preferably consists of the following components:

a locking element 2 in the form of a sleeve which can be applied to the end 6.1 of the piston rod, whose end facing the closed end of the cylinder 1 carries an externally toothed gearwheel 2.1 and at the other end at least one lobe 2.2 engaging in the piston 4,

- An internally at the closed end of the cylinder 1 arranged internally toothed gear 1 .1, in which the externally toothed gear engages 2.1, and - A arranged inside the closed end of the cylinder 1 central cone 1 .2, which presses the teeth of the externally toothed gear apart in the internally toothed gear 1 .1. On the outside of the cylinder 1 lying end of the piston rod 6, a dial 9 can be fixed against rotation for better operation.

It is conceivable in this context, at least one direction of rotation, for example in the form of an arrow or double arrow with, for example, symbolically indicated magnification and / or reduction of the flow cross-section, for example by a plus and / or a minus symbol and / or a large and / or a small Circle in which direction upon rotation of the piston rod 6 relative to the cylinder 1, the flow area is increased and decreased. Alternatively, a scaling can be provided which, for example, symbolically reproduces a progressive enlargement and reduction depending on the rotational position.

For example, optimized setting positions can be identified for certain applications, for example for revolving doors, for upwardly opening Schapps, compartment flaps, etc.

Preferably, the piston rod 6 can be brought into contact with an adjustable furniture part. The cylinder 1 may be connected to its rod end closed and a fixed piece of furniture.

The cylinder 1 of the fluid damper may be closed by a closure part 8 at its end, also referred to as an open end side, which is designed to be free from a passage of the piston rod 6. At least one passage opening 4.2 can be assigned at least one closing element spring-loaded with respect to the piston 4 with a number of closing surfaces 3.2 corresponding to the number of passage openings 4.2.

For example, the closing element may comprise at least one wing 3.1 rotatably mounted in the piston 4. This wing 3.1 can progressively wear out as the bodies move relative to each other and the piston 4 / piston rod and cylinder 1 move together as a result of this movement as the piston 4 penetrates into the cylinder 1. The wear can be done depending on the speed or pressure on the piston rod 6, the fluid passage opening 4.2 in the piston 4 and / or between the piston 4 and cylinder 1 against a spring load. At standstill and when moving the body away from each other, the spring load returns the wing 3.1 and releases the passage opening 4.2. When driving away from each other, the body of the piston 4 and the cylinder 1 by advancing Austauch or pull or drive or drive the piston 4 from the cylinder 1 apart.

Accordingly, the closing element may comprise at least one wing 3.1 rotatably mounted in the piston 4. This can by moving the piston 4 relative to the cylinder 1 in a first direction, in particular into each other, depending on the speed or pressure on the piston rod 6, the fluid passage opening 4.2 in the piston 4 and / or between the piston 4 and cylinder 1 against closing a spring load progressively. When moving the piston 4 relative to the cylinder 1 in a second direction opposite to the first direction, in particular apart, the spring load can reset the wing 3.1 and the passage opening 4.2 be released.

A movement of the piston 4 relative to the cylinder 1 in a first direction, in particular into one another, can take place when the bodies are moved relative to one another, ie relative to one another.

A movement of the piston 4 relative to the cylinder 1 in a second direction, which is opposite to the first direction, in particular apart, can take place when the bodies are apart, ie

Moving away from each other.

The spring load can be advantageously generated with a little space requiring coil spring 3.

In Fig. 1, the components of the fluid damper, which are to be arranged in the cylinder 1, shown in dismantled construction. The fluid damper shown in FIG. 1 consists of a cylinder 1, a locking element 2, a sleeve 3 with wings 3.1, a piston 4, a coil spring 5, a piston rod 6, a notching disc 7, a closure part 8 and a dial 9. The damper is attached to the closed end of the cylinder 1 (left side) to a fixed piece of furniture. The cylinder 1 carries according to Fig. 2 at the closed end an internally toothed gear 1 .1 and a centrally in the gear 1 .1 arranged cone 1 .2. In this internally toothed gear 1 .1 can engage an externally toothed gear 2.1 of the locking element 2. The locking element 2 is a cylinder sleeve which can be aufgeklippst on the end of the piston rod 6 (point 6.2) and carries on its outer surface at least one cam 2.2 (2.3). The cam 2.2 engages in a recess of the piston 4 a. The previously explained part of the fluid damper serves to keep the piston 4 in a selected radial position.

The piston 4 is provided with a cylindrical section 4.1 which can be pushed onto the tapered end 6.1 of the piston rod 6 and in which a fluid passage opening 4.2 is formed. The outer diameter of this cylindrical section 4.1 is adapted to the inner diameter of the cylinder 1. Between the locking element 2 and the section 4.1, the wing 3.1 bearing sleeve 3 on the tapered end 6.1 of the piston rod 6 can be inserted. The availability is such that the sleeve can rotate radially on the end 6.1. Between the left end of the sleeve and the locking element 2 and / or between the right end of the sleeve 3 and the section 4.1, the helical spring 5 or 5 ^{'can be} inserted on the tapered end 6.1 of the piston rod 6. The coil spring is supported with its one end on the wing 3.1 and with its other end to a stop 4.3 of the piston 4. In the starting position of the fluid damper, this helical spring holds the wing 3.1 in such a position that its closing face 3.2 does not cover the fluid passage opening 4.2 (FIG. 2).

The notching disc 7 with a notch 7.1 on its circumference is mounted radially non-rotatably on the tapered end 6.1 of the piston rod, so that it can also be rotated with the rotation of the piston rod 6.

The open end of the cylinder 1 is closed with the closure part 8, which is adapted in outer diameter to the inner diameter of the cylinder 1. In this case, the piston rod 6 is rotatably guided by the closure part 8. On the end of the piston rod 6 carried out by the closure part 8, the dial wheel 9, which is preferably provided with a corrugation, is fastened, which during closing ßen of the adjustable furniture part with the adjustable furniture part can be brought into contact.

The presetting for the intended application is carried out as follows.

By manual pressure on the dial 9, the internal gear 1.1 and the external gear 2.1 are brought into engagement in a selected radial position of the piston 4, as shown in FIG. 7 shows. Here, the cone 1.2 presses apart the teeth of the externally toothed gear 2.1 and wedges them with the teeth of the internally toothed gear 1.1. Thus, the radial position of the piston 4 is fixed. Now, by means of the adjusting wheel 9, the piston rod 6 is rotated such that the notching disc 7 more or less closes the fluid passage opening 4.2 according to the application. Thus, the desired cross-section of the opening of the piston 4 is set for the fluid. The cone 1.2 may be arranged at the end on an inner side of the cylinder 1, preferably in the region of the internally toothed gear 1.1.

As is also apparent from Fig. 7, the teeth of the gear 2.1 are moved by the pressure of the gear 2.1, and the piston 4, on the cone 1.2 away from each other, in particular approximately radially outward. At least the teeth of the toothed wheel 2.1 are moved away from the piston rod 6 by a longitudinal axis of the piston rod at least in the region of the point 6.2, which can also be referred to as a piston rod head. As a result of this movement of the teeth of the gearwheel 2.1 outside, they can be brought into engagement with the teeth of the gearwheel 1.1, wherein the teeth of the gearwheel 1.1 can be spaced apart from the teeth of the gearwheel 2.1 radially to the longitudinal axis of the piston rod 6. As a result of the pressure of the toothed wheel 2. 1 on the conical cylinder 1 .2, a non-rotatable connection between piston rod 6 and piston 4, in particular the locking element 2 and the piston rod 6, can be canceled at least temporarily. This allows a low-friction relative movement between the piston rod 6 and piston 4 or between the piston rod 6 and locking device 2, which may be integrally formed with the piston, allows.

It can be present as a double unrotatability. On the one hand, the locking element / locking device relative to the piston 4 and / or an unrotatability of the piston rod 6 with respect to the locking device 2 or the piston 4.

The sequence of movement when closing and opening the bodies at low and high speed is the following.

The unrotatability of the piston rod 6 relative to the locking device 2 and / or the piston 4 may in particular exist in the operating state, ie when the fluid damper fulfills its primary function of the damped method of bodies to each other. On the other hand, the Unverdrehbarkeit be repealed, according to the foregoing, while a damping effect by rotation of the wheel 9 and thus the piston rod 6 and the notch 7. 1 relative to the opening 4.2 is adjusted, the gear 2.1 with the conical cylinder 1.2 into engagement can stand or the gear 2.1 can be in engagement with the gear 1.1.

At low closing speed of the main flow of the fluid of FIG. 6 flows through the fluid passage opening 4.2 and the preset notch 7.1. The wing 3.1 remains in a starting position. There is only a minimal braking effect. At very high speed, ie at very high pressure on / on the piston rod 6 (eg when feeding each other bodies / piston and cylinder, the wing 3.1 closes with its closing surface 3.2, the fluid passage opening 4.2 so far that only a small flow area through The fluid flows through the outer gap between the cylinder 1 and the piston 4 and causes a counterforce.

Reduces the speed of doing so, then towards the end of the closing process, the body is caused by the coil spring 5 a rotational movement of the blade 3.1 in the opposite direction, which leads to a continuous opening of the fluid passage opening 4.2. This consequently leads to a reduction in the piston speed and a soft stop of the body to be closed.

It can be seen that the invention can be realized by a fluid damper for mutually adjustable body with a piston 1 adjustably guided in a cylinder 1, which is connected to a led out of the cylinder 1 piston rod 6, which is engageable with the adjustable furniture part in contact , in which

- The cylinder 1 is connected to the rod-free closed end and the stationary furniture part and in the piston 4 at least one passage opening 4.2 is provided for a fluid in the cylinder 1,

- When moving the body against each other and thus taking place movement of the piston 4 and cylinder 1 into each other while driving each other of the piston 4 and cylinder 1 by progressive penetration of the piston 4 in the cylinder 1 in response to the speed or pressure on the piston rod 6 in the Piston 4 rotatably mounted wing 3.1, the fluid passage opening 4.2 in the piston 4 progressively closes and when moving the body from each other and thus taking place movement of the piston 4 and the cylinder 1 apart under divergence from Piston 4 and cylinder 1 by progressively pulling or driving the piston 4 out of the cylinder 1 a helical spring 3 resets the wing 3.1 and releases the passage opening 4.2,

- The piston 4 is cylindrical and adapted to the outer diameter of the inner diameter of the cylinder 1,

- The cylinder 1 is closed at the open end side with a closure part 8,

wherein on the cylinder located in the end of the piston rod 6, a piston 4 is retained in a desired position in the cylinder 1 retaining radially non-rotatably, and wherein on the piston rod 6 a notched disc 7 is fixed non-rotatably, by means of whose notch 7.1 of the flow cross-section of Fluids at the location of the fluid passage opening 4.2 of the piston 4 can be preset.

Claims

1. fluid damper for mutually adjustable body with a cylinder (1) adjustably guided piston (4), wherein in the piston (4) and / or between the piston (4) and cylinder (1) at least one passage opening (4.2) for fluid flowing through is formed, comprising adjusting means for setting a limit of at least the largest possible flow cross-section of the fluid at least one passage opening (4.2) on the operative fluid damper, characterized

the piston (4) is connected to a piston rod (6) brought out of the cylinder (1),

that the adjusting means comprise a locking device (2) which holds the piston (4) in a desired position in the cylinder (1), and

the locking device is mounted radially non-rotatably on the end of the piston rod (6) located in the cylinder.

2. fluid damper according to claim 1, wherein the locking device consists of the following components:

- A locking element (2) in the form of a coatable on the end (6.1) of the piston rod whose end facing the closed end of the cylinder (1) an externally toothed gear (2.1) and at least one other in the piston (4) engaging at the other end Carries cam (2.2),

- An internally toothed gear (1.1) arranged inside the closed end of the cylinder (1) into which the externally toothed gear (2.1) engages, and

- A centrally disposed on the inside of the closed end of the cylinder (1) central cone (1.2) which presses apart the teeth of the externally toothed gear in the internally toothed gear (1.1).

3. fluid damper according to claim 1 or 2,

wherein the adjusting means comprise a notchable disc (7) mounted on the piston rod (6), by means of which at least one notch (7.1) the flow cross-section of the fluid at the location of at least one passage opening (4.2) of the piston (4) and / or between piston ( 4) and cylinder (1) is presettable, comprise.

4. fluid damper according to claim 1, 2 or 3,

wherein on the outside of the cylinder (1) lying end of the piston rod (6) a dial (9) is rotatably mounted.

5. fluid damper according to one of claims 1 to 4,

wherein the piston rod (6) can be brought into contact with an adjustable furniture part.

6. fluid damper according to one of the preceding claims,

wherein the cylinder (1) is connected to the rod end closed with a fixed piece of furniture.

7. fluid damper according to one of the preceding claims,

wherein the piston (4) is cylindrical and adapted with the outer diameter of the inner diameter of the cylinder (1).

Fluid damper according to one of the preceding claims,

wherein the cylinder (1) is closed at the open end side with a closure part (8). Fluid damper according to one of the preceding claims, wherein the at least one passage opening (4.2) is associated with at least one relative to the piston (4) spring-loaded closing element with a number of passage openings (4.2) corresponding number of closing surfaces (3.2).

Fluid damper according to claim 9,

wherein the closing element comprises at least one vane (3.1) rotatably mounted in the piston (4) which moves in a first direction when the piston (4) is moved relative to the cylinder (1) in dependence on the speed or pressure on the piston rod (6). the fluid passage opening (4.2) in the piston (4) and / or between the piston (4) and cylinder (1) against a spring load progressively closes and when moving the piston (4) relative to the cylinder (1) in one of the first direction opposite, second Direction the spring load the wing (3.1) resets and the passage opening (4.2) releases

Fluid damper according to claim 9,

wherein a coil spring (3) generates the spring load.